(91,657 ratings)
K-9 Mail is an open source email client with support for multiple accounts, search, IMAP push email, multi-folder sync, flagging, filing, signatures, BCC-self, PGP/MIME & more!

K-9 supports IMAP, POP3 and Exchange 2003/2007 (with WebDAV).

Install the app "OpenKeychain: Easy PGP" to encrypt/decrypt your emails using OpenPGP.

K-9 is a community developed project. If you're interested in helping to make the most popular open source email client on Android even better, please join us! You can find our bug tracker, source code, mailing list and wiki at
We're always happy to welcome new developers, designers, documenters, bug triagers and friends.

If you're having trouble with K-9, please report a bug at rather than just leaving a one-star review. We don't mind you telling the world that you're frustrated, but if you use our bug tracker, we have a better chance of fixing whatever's giving you a hard time.

You can find K-9's release notes at:

(People sometimes call K-9: K9, K9 Mail, K-9 Email, K9 Email, K9 E-Mail, k9mail or k9email.)
From version K-9 Mail 5.718 beta:
Hide empty footer view in message list
Don't show standard message actions for messages in the Outbox
Tweaked UX of recipient chips
Refresh the list of folders when refreshing a folder
Apply global display settings to the message list when returning from settings screen
Many internal changes
Updated translations
All versions
August 18, 2020
June 20, 2020
June 5, 2020
June 1, 2020
May 14, 2020
April 24, 2020
April 20, 2020
March 6, 2020
March 3, 2020